Firebase.initializeApp() throwing "No Firebase App '[DEFAULT]' has been created" - firebase

Question

I keep getting this error, how can I fix this?
This is my flutter version.
My Flutter version is　Flutter 2.6.0-11.0.pre.
This is my flutter doctor -v, seems like there is no problem.
[√] Flutter (Channel dev, 2.6.0-11.0.pre, on Microsoft Windows [Version 10.0.19043.1348], locale ja-JP)
• Flutter version 2.6.0-11.0.pre at C:\hobby-dev\comture-training\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 4b330ddbed (8 weeks ago), 2021-09-16 17:29:58 -0700
• Engine revision 5b81c6d615
• Dart version 2.15.0 (build 2.15.0-116.0.dev)
[X] Android toolchain - develop for Android devices
X Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
[!] Android Studio (not installed)
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).
[√] IntelliJ IDEA Community Edition (version 2020.1)
• IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.1.2
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
[√] VS Code (version 1.62.2)
• VS Code at C:\Users\bowti\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.28.0
[√] Connected device (2 available)
• Chrome (web) • chrome • web-javascript • Google Chrome 95.0.4638.69
• Edge (web) • edge • web-javascript • Microsoft Edge 93.0.961.52
! Doctor found issues in 2 categories.
And this is my pubspec.yml.
cupertino_icons: ^1.0.2
google_fonts: ^2.1.0
http: ^0.13.0
http_parser: ^4.0.0
firebase_core: ^1.10.0
cloud_firestore: ^3.1.0
I AM callinig Firebase in my main function.
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(WebConsoleTop());
}
Any suggestions?
I googled a lot, and found out that newest version of cloud_firestore needs "await Firebase.initializeApp();", so I did it.
According to my Error log, it seems like the code "await Firebase.initializeApp();" is causing this error.
Any idea what is going on?
FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp() (app/no-app).
at Object.u [as app] (https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js:1:18836)
at Object.app$ [as app] (http://localhost:53770/packages/firebase_core_web/src/interop/core.dart.lib.js:31:101)
at initializeApp (http://localhost:53770/packages/firebase_core_web/firebase_core_web.dart.lib.js:101:25)
at initializeApp.next (<anonymous>)
at runBody (http://localhost:53770/dart_sdk.js:40064:34)
at Object._async [as async] (http://localhost:53770/dart_sdk.js:40095:7)
at firebase_core_web.FirebaseCoreWeb.new.initializeApp (http://localhost:53770/packages/firebase_core_web/firebase_core_web.dart.lib.js:81:20)
at initializeApp (http://localhost:53770/packages/firebase_core/firebase_core.dart.lib.js:100:59)
at initializeApp.next (<anonymous>)